Science

Water

Question:

Name two processes responsible for the formation of clouds.

Answer:

Evaporation and transpiration.

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Water

Q 1.

How does the failure of rainfall affect people on the earth?

Q 2.

What is rainwater harvesting? Describe the method of rainwater harvesting.

Q 3.

Mention two main functions of water for living organisms.

Q 4.

What is transpiration?

Q 5.

Write the sources of water on the earth.

Q 6.

What is meant by conservation of water? Suggest three methods to conserve water.

Q 7.

What is meant by the conservation of water?

Q 8.

In which forms, water exists on the earth?

Q 9.

Which of the following statements are "true"?
(a) Water vapour is present in air only during the monsoon.
(b) Water evaporates into air from oceans, rivers and lakes but not from the soil.
(c) The process of water changing into its vapour is called evaporation.
(d) The evaporation of water takes place only in sunlight.
(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.

Q 10.

How does heavy rain affect us?

Q 11.

Fill up the blanks in the following:
(a) The process of changing of water into its vapour is called_______________ .
(b) The process of changing water vapour into water is called_____________ .
(c) No rainfall for a year or more may lead to _____________ in that region.
(d) Excessive rains may cause__________ .

Q 12.

When does a drought occur?

Q 13.

During winters why do we see more fog in close areas where there are lots of .trees?

Q 14.

During winters why do we see more fog in close areas where there are lots of .trees?

Q 15.

To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet?

Q 16.

There are 4 containers A, B, C and D with same amount of water in each. Answer the following based on them.
(a) Name the container in which water will evaporate faster than all others.
(b) Name the container in which water will evaporate very slowly.
Give reason for your answer.

Q 17.

Name two processes responsible for the formation of clouds.

Q 18.

How are the clouds formed?

Q 19.

Why is ocean water not suitable for domestic use?

Q 20.

To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet?

Q 21.

Take out a cooled bottle of water from refrigerator and keep it on a table. After some time you notice a puddle of water around it. Why?

Q 22.

How are clouds formed?

Q 23.

Why does the water split on the floor disappear after some time?

Q 24.

State for each of the following whether it is due to evaporation or condensation:
(a) Water drops appear on the outer surface of a glass containing cold water.
(b) Steam rising from wet clothes while they are ironed.
(c) Fog appearing on a cold winter morning.
(d) Blackboard dries up after wiping it.
(e) Steam rising from a hot girdle when water is sprinkled on it.

Q 25.

Suppose you want to dry your school uniform quickly. Would spreading it near an anghiti or heater help you? If yes, how?